<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>welcome</title>
    <script type="text/javascript" src="/static/js/jquery-3.4.1.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            var span = $("#context");
            span.html(span.html() + GetQueryString("email"));
        });

        function GetQueryString(name) {
            var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
            var r = window.location.search.substr(1).match(reg);
            if (r != null) return unescape(r[2]);
            return null;
        }
    </script>
</head>
<body>
<div>
    <div style="text-align: center">
        <span id="context">欢迎：</span>
    </div>
</div>
</body>
</html>